The College Board has yet to release their 2015-2016 college cost averages, but working off last year's numbers, we are using the following for our planning for undergraduate costs. Starting at the top:

PRIVATE FOUR-YEAR

Tuition & Fees/Room & Board: $43,692

PUBLIC FOUR-YEAR (OUT-OF-STATE)

Tuition & Fees/Room & Board: $33,745

PUBLIC FOUR-YEAR (IN-STATE)

Tuition & Fees/Room & Board: $19,511

PUBLIC TWO-YEAR (IN-DISTRICT)

Tuition & Fees/Room & Board: $11,307

and because two-year students often live at home . . .

Tuition & Fees only: $3,447

ASSUMPTIONS & CAVEATS

2014-2015 averages (Source: College Board) adjusted for inflation
Reflects published costs before financial aid
Inflation assumptions:

Tuition & fees: 3.0% (or roughly 2x projected one-year CPI-U)
Room & board except two-year: 3.0%
Two-year room & board: 2.0%

These are national averages - your circumstances may vary greatly. The two-year numbers in particular are skewed heavily by California. Without California, tuition & fees are higher, but room & board is likely lower.

ITEMS OF NOTE

Last year, the trend of cost increases of roughly 2x inflation continued.
The big jump in tuition occurs at the state border, especially for prestigious state universities such as Michigan, Virginia, and the University of California system.